Sarah, The short answer is that, yes, you can substitute butter for shortening in cookies. It will, however, change the texture and appearance of the end product. Because shortening is 100% fat and butter is roughly 85% fat and 15% water, cookies with butter in them tend to spread more during baking.
Usage: Yang is a popular first name. It is more often used as a boy (male) name. People having the name Yang are in general originating from China, France, South Korea, United States of America.
Yin and Yang are ancient Chinese philosophical terms, with the Yin Yang Theory being a fundamental part of Feng Shui. It is a Chinese theory on the perspective of continuous change and balance.